WASHINGTON (CNN) – President Bush will undergo a routine colonoscopy Saturday, and will transfer power to Vice President Dick Cheney during the procedure, expected to take about two and a half hours, the chief White House spokesman said.

Tony Snow said Friday that the procedure, during which a doctor looks for any signs of cancer, will be carried out at Camp David, Maryland, and the president will be placed under anesthesia.

Bush's last colonoscopy was in June 2002, and no abnormalities were found, Snow said.